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Known bugs
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Note: With the release of IDA ICE 5, known bugs are published in the
online help wiki. Inside IDA ICE 5, please select "Online help wiki" from the Help menu.
In the online help wiki go to IDA ICE > Info center > Known bugs
The bugs published on this page are mainly computational
bugs that affect the calculation results. There is a bug fix patch
for each bug, or at least a plan for when the bug will be fixed.
As a service to our customers we also make patches
for other bugs reported to us. We do not publish these patches on
this page but collect them in an Excel
document found here. In this document there is an indication
of how safe a patch is. These patches might not always be well tested
and should only be installed by customers experiencing the specific
problem that the patch fixes.
How to get a patch
Recent patches can be downloaded directly from this page (see download
links below). To get a download link to an older patch, please email
us at ice.support@equa.se.
Make sure to include the patch number.
Service Pack
With certain intervals we collect fixed bugs into a Service
Pack (SP) that is installed in the same way as a new version. A
Service Pack includes fixes for both computational bugs and other
bugs.
February 6, 2024
Roof window: If a zone has an inclined (> 10°) roof window (e.g. in an atrium) the distribution of the transmitted direct radiation to the different zone surfaces may in some cases become incorrect. This is most likely to happen if the zone height is low compared to the width or length and the inclination of the roof is low.
Introduced in IDA ICE 4.0 (patch for IDA ICE 4.8 SP2 available)
Patch no: 240206.1-B (light-distr.fsl) download
Fixed in IDA ICE 5.0.0.1
August 1, 2023
Leaks/openings between zones: If a leak is inserted in the ceiling of the bottom zone and another in the floor of the top zone, the air exchange between the two zones may become overrated. Smaller differences in air exchange between two zones may also occur depending on in which zone the leaks or an opening is inserted.
Introduced in IDA ICE 4.0 (patch for IDA ICE 4.8 SP2 available)
Patch no: 230801.1-B (detwind-intframe-tir-slat-ml-ew-leak-patch.fsl) download (Replaces patch no 211221.1-B, detwind-intframe-tir-slat-ml.fsl)
Fixed in IDA ICE 5.0
March 24, 2023
Localization Switzerland: In the zone templates according to SIA 2024:2021, the schedule of equipment outside operating hours is not correct.
Introduced in Localization Switzerland 4.8.0.2 (patch for Localization Switzerland 4.8.0.2 available)
Patch no: 230324.1-B (SIAMB2024_Zonenvorlagen_2021.zip) download
Fixed in Localization Switzerland 5.0
October 27, 2022
Floor heating/cooling: If a floor with floor heating/cooling is connected to the ground, the floor heating/cooling layer is immersed in the construction "External constructions" instead of "Constructions toward ground". If these constructions are different the heat transmission through the floor can be over- or underestimated.
Introduced in IDA ICE 4.8 (patch for IDA ICE 4.8 SP2 available)
Patch no: 221027.1-B (floor-heat-upper-layer-patch.fsl) download
Fixed in IDA ICE 5.0
July 8, 2022
Localization Switzerland: In the calculation standard SIA 380/2:2022, the setpoint in the basic design heating type was corrected. In addition, the area calculation of floors against ambient air is fixed.
Introduced in Localization Switzerland 4.8.0.1 (patch for Localization Switzerland 4.8.0.1 available)
Patch no: 080723.1-C (local-ch-patch-setpoint-facearea.fsl) download
Fixed in Localization Switzerland 5.0
June 1, 2022
Anpassning Sverige: För BBR-versionerna 21-28 redovisas ett för högt U-värde för ytor mot ouppvärmda zoner eftersom det tillkommande värmemotståndet från den ouppvärmda zonen inte medräknas. BBR-version 29 beräknas korrekt. Dessutom medräknas luftläckaget felaktigt om det finns en öppen dörr mellan uppvärmda och ouppvärmda zoner vilket leder till ett för högt U-värde för den gemensamma konstruktionsdelen. Detta fel gäller alla BBR-versioner.
Introduced in Localization Sweden 4.8.0.2 (patch for Localization Sweden 4.8.0.2 available)
Patch no: 220601.1-B (local-se-unconditioned-patch.fsl) download
Fixed in Localization Sweden 5.0
May 23, 2022
Localization Switzerland: In the calculation standard SIA 382/2:2011, the SIA 380/2:2022 setpoints with basic design heating type and without control deviation are used instead of the zone setpoints. This can lead to incorrect heating and cooling setpoints in the calculation standard SIA 382/2:2011.
Introduced in Localization Switzerland 4.8.0.1 (patch for Localization Switzerland 4.8.0.1 available)
Patch no: 220523.1-B (local-ch-patch-setpoint_sia382-2.fsl) download
Fixed in Localization Switzerland 5.0
March 17, 2022
Detailed window: When the inner window of a ventilated construction is opened and the floor of the ventilated construction is above ground level, the pressure outside the window is set too low, which may affect the air exchange depending on the existence of other leaks or openings in the zone to the outside or to other zones.
Introduced in IDA ICE 4.0 (patch for IDA ICE 4.8 SP2 available)
Patch no: 220317.1-B (leak-opening-bottom-height.fsl) download
Fixed in IDA ICE 5.0
February 24, 2022
For internal mass (furniture, convective internal mass, extra wall mass), the calculated heat capacity is less than set in the construction. The effect of this is negligible in most cases but can for settings of large mass heat capacities damp the room air temperature swing too little and lead to a slight overestimation of heating and cooling.
Introduced in IDA ICE 2.0
Fixed in IDA ICE 5.0
February 23, 2022
When using an AHU with enthalpy wheel there is no cold recovery of the exhaust air. This may lead to an overestimation of the cooling load.
Introduced in IDA ICE 4.8 (patch for IDA ICE 4.8 SP2 available)
Patch no: 220223.1-B (detwind-intframe-tir-slat-ml-ew-leak-patch.fsl) download (Replaces patch no 211221.1-B, detwind-intframe-tir-slat-ml.fsl)
Fixed in IDA ICE 5.0
December 21, 2021
Detailed window: For a window with a micro lamella shading placed on a roof or other non-vertical surface the solar transmittance may be underestimated.
Introduced in IDA ICE 4.8 (patch for IDA ICE 4.8 SP2 available)
Patch no: 220223.1-B (detwind-intframe-tir-slat-ml-ew-leak-patch.fsl) download (same patch as for February 23, 2022)
Fixed in IDA ICE 5.0
October 6, 2021
ASHRAE 90.1 extension: When the Baseline Building is created, exhaust air energy recovery is not included for system 1-4, even if the conditions in Table 6.5.6.1 of the ASHRAE 90.1 2010-standard are met. This leads to an underestimation of the energy use in the Baseline building.
Introduced in ASHRAE 90.1 1.0 (patch for ASHRAE 90.1 1.22 available)
Patch no: 211006.1-B (a901-run-baseline-patch.fsl) download
Fixed in ASHRAE 90.1 5.0
September 22, 2021
Detailed window: For a window with a window integrated shading of the type venetian blind or shutter, the solar transmittance may be overestimated and the solar reflectance underestimated, which may lead to a too high cooling and/or a too low heating demand. The error may be of a similar magnitude as a -5 degree error in slat angle might lead to.
Introduced in IDA ICE 4.0 (patch for IDA ICE 4.8 SP2 available)
Patch no: 220223.1-B (detwind-intframe-tir-slat-ml-ew-leak-patch.fsl) download (same patch as for February 23, 2022)
Fixed in IDA ICE 5.0
June 30, 2021
Detailed window: For windows with a partly IR transmitting shading, e.g. a non-closed venetian blind, the solar gain may be underestimated for an exterior and overestimated for an interior shading. This may lead to too high or too low heating or cooling demand depending on the shading position.
Introduced in IDA ICE 4.5 (patch for IDA ICE 4.8 SP2 available)
Patch no: 220223.1-B (detwind-intframe-tir-slat-ml-ew-leak-patch.fsl) download (same patch as for February 23, 2022)
Fixed in IDA ICE 5.0
June 16, 2021
Detailed window: When choosing "Wall" as a "Ventilated construction" and having more than a single window on the wall, no error message is given. The model for Ventilated construction is limited to a single inner window.
Introduced in IDA ICE 4.0
Fixed in IDA ICE 5.0
June 15, 2021
Detailed window: For windows with a high U-value, mainly single pane windows, the heat losses may in some cases become overestimated, which could lead to too high heating demands and/or too low cooling demands in the simulation results.
Introduced in IDA ICE 4.8 SP2 (patch for IDA ICE 4.8 SP2 available)
Patch no: 220223.1-B (detwind-intframe-tir-slat-ml-ew-leak-patch.fsl) download (same patch as for February 23, 2022)
Fixed in IDA ICE 5.0
June 8, 2021
Tilläggsmodulen Miljöbyggnad: För indikator 3 (Energianvändning) redovisas inte korrekt energikrav om BBR 29 valts i BBR-fliken.
Introduced in Miljöbyggnad 1.08 for IDA ICE 4.8 (patch available)
Patch no: 210608.1-B (mb18-bbr29-kravs-patch.fsl) download
Fixed in Miljöbyggnad 1.081
March 22, 2021
For a building without external windows the first chosen month's climate data is used for all months when running a cooling or overheating simulation. This might lead to incorrect results.
Introduced in IDA ICE 4.7 (patch for IDA ICE 4.8 SP2 available)
Patch no: 210322.1-B (coolsim-patch.fsl) download
Fixed in IDA ICE 5.0
June 4, 2020
Version Manager: In some cases (mainly in projects with multiple sub-versions) some versions are incorrectly marked as modified after simulation (version name is gray in the project's summary table). The result shown in the project's summary table and the model's summary and details tab can be incorrect for these versions. This can lead to misinterpretation of results.
Introduced in IDA ICE 4.8 SP2 (patch for IDA ICE 4.8 SP2 available)
Patch no: 200604.1-B (vers-mod-time.fsl) download
Fixed in IDA ICE 5.0
February 13, 2020
Anpassning Sverige: Redovisningen av U-medelvärde blir felaktigt om man använder rumsmultiplikatorer, "Antal zoner av denna typ", för rum som angränsar mot ej uppvärmda ytor. Det finns även ett problem med ytor kopplade till krypgrund som får genereringen av rapporter att krascha.
Introduced in Localization Sweden 4.7 and Miljöbyggnad 1.0 (patch for Localization Sweden 4.8 and Miljöbyggnad 1.07 available)
Patch no: 200213.1-B (local-se-recalc-u) download
Fixed in Localization Sweden 4.8.0.1 and Miljöbyggnad 1.08
February 12, 2020
Running a simulation with time-split parallelization might lead to wrong values of the peak values in the reports and summary tables (e.g. peak demand in kW shown under Delivered Energy in the Delivered Energy report).
Introduced in IDA ICE 4.7 (patch for IDA ICE 4.8 SP1 available)
Patch no: 200212.1-B (merge-snap-patch.fsl) download
Fixed in IDA ICE 4.8 SP2
November 29, 2019
The transparency setting of imported shading objects is ignored if the shading object is saved with a reference to the geometry file and not in the system file (*.idm), i.e. if the checkbox in Options > Preferences > CAD Import is unchecked and the imported object has more vertices than the given number (default 10000). This can lead to under-estimation of daylight levels, solar heating and cooling loads.
Introduced in IDA ICE 4.5 (patch for IDA ICE 4.8 SP1 available)
Patch no: 191129.1-B (vtklib-4.8.0.6.fsl) download
Fixed in IDA ICE 4.8 SP2
November 7, 2019
A balcony may, after saving and reopening a model, incorrectly be placed on the building body if less than 50% of the section area of the balcony covers the zone, e.g. when a balcony with very small height is placed just below the zone floor; or incorrectly be placed on the external zone wall if the balcony is placed higher than 1 m below the ceiling of the zone when there is no zone above. This can lead to over- or under-estimation of daylight levels, solar heating and cooling loads.
Introduced in IDA ICE 4.5 (patch for IDA ICE 4.8 SP1 available)
Patch no: 191107.1-B (flat-balcony.fsl) download
Fixed in IDA ICE 4.8 SP2
August 26, 2019
Tilläggsmodulen Miljöbyggnad: För indikator 1 (Värmeeffektbehov) saknas ventilationsförluster i resultatet om det finns lokala luftbehandlingsaggregat i zonerna.
Introduced in Miljöbyggnad 1.07 for IDA ICE 4.8 (patch available)
Patch no: 190826.1-B (mb18-local-ahus.fsl) download
Fixed in Miljöbyggnad 1.08
February 13, 2019
When using a window with a venetian blind in a Daylight calculation, the given transmittance value for the glazing to Radiance is calculated for 45° slat angle, regardless of what angle is set, unless the venetian blind is added as a venetian shade layer in the glazing.
Introduced in IDA ICE 4.8 SP1 (patch for IDA ICE 4.8 SP1 available)
Patch no: 190213.1-B (daylight-slat.fsl) download
Fixed in IDA ICE 4.8 SP2
November 25, 2018
The last input in a form can be lost if the project is saved immediately after the input, before switching to another field or pressing Enter. The problem does not occur for dialogs (with OK and Cancel buttons). A similar error can occur in floor plan where the last input on the side bar can be lost when pressing Done in the Editing dialog. This may lead to unexpected results if the project is simulated without the last input.
Introduced in IDA ICE 4.8 SP1 (patch for IDA ICE 4.8 SP1 available)
Patch no: 181125.1-B (accept-input.fsl) download
Fixed in IDA ICE 4.8 SP2
October 17, 2018
Radiance daylight calculation: If a daylight calculation is performed for a zone after changing the name of the zone and if the 3D tab was opened before
the name change, the calculated daylight factor or illuminance level will be too low. If the user after the name change goes to the 3D tab and does
View > Refresh or closes and reopens the model, this does not happen.
Introduced in IDA ICE 4.7 (patch for IDA ICE 4.8 available)
Patch no: 181017
Fixed in IDA ICE 4.8 SP1
August 24, 2018
Radiance daylight calculation: Detailed windows with ventilated construction (double glass façade) are represented by a geometry with
incorrect optical properties. This can lead to over- or under-estimation of the daylight levels.
Introduced in IDA ICE 4.7 (patch for IDA ICE 4.8 available)
Patch no: 180824
Fixed in IDA ICE 4.8 SP1
August 23, 2018
3D view: When the 3D view is loaded or refreshed the 3D geometry is unnecessarily redrawn a large number of times. This can lead to
long loading and refreshing times for large models which can be a significant inconvenience. It will not have any effect on any calculation results.
Introduced in IDA ICE 4.8 (patch for IDA ICE 4.8 available)
Patch no: 180823
Fixed in IDA ICE 4.8 SP1
July 4, 2018
Radiance daylight calculation: Walls and slabs consisting of only one material layer has the same surface properties on
both sides in the geometry sent to Radiance. This can cause wrong daylight results if the surfaces properties should be different.
Introduced in IDA ICE 4.7 (patch for IDA ICE 4.8 available)
Patch no: 180704
Fixed in IDA ICE 4.8 SP1
June 4, 2018
Defining constructions: The warning that a wall/slab construction is defined differently in adjacent zones, shown when running a simulation, has accidently been removed. If a wall/slab construction is defined differently in adjacent zones one construction is chosen by the program which may cause unexpected results.
Introduced in IDA ICE 4.8 (patch for IDA ICE 4.8 available)
Patch no: 180604
Fixed in IDA ICE 4.8 SP1
May 7, 2018
Radiance daylight calculation: If integrated shading of the type Micro lamella is used in the detailed window model,
some of these windows may get zero daylight transmission due to a memory handling problem in our 3D environment.
The problem occurs randomly and is not controllable by the user. If you do get light through the window, it should be correct.
Introduced in IDA ICE 4.8 (patch for IDA ICE 4.8 available)
Patch no: 180507
Fixed in IDA ICE 4.8 SP1
April 13, 2018
Tilläggsmodulen Miljöbyggnad: För indikator 3 (solvärmelast) och indikator 11 (termiskt klimat
sommar) hämtas resultatet för max solvärmelast och PPD
felaktigt från september månad enbart, och inte från
alla månader från mars till och med september.
Introduced in Miljöbyggnad 1.05
for IDA ICE 4.8 (patch available)
Patch no: 180413
Fixed in Miljöbyggnad 1.07
March 7, 2018
Radiance daylight calculation: If a surface material with a specularity value (the amount of shininess) larger than 0 is used for
non-transparent walls or shading objects the reflection is underestimated. For shiny materials like mirror and metal surfaces
this can lead to an underestimation of the daylight levels. For a transparent surface material with only specular reflection
like Plexiglas the daylight calculation is incorrect.
Introduced in IDA ICE 4.7 (patch for IDA ICE 4.8 available)
Patch no: 180307
Fixed in IDA ICE 4.8 SP1
February 15, 2018
Room units: If an IDA ICE model with a Water Radiator or a Cooling Device is saved as a packed file in an earlier version
and then opened in IDA ICE 4.8, the properties of these room units will be changed to the ones of the default device type.
This will affect the design power of the room unit. The default device usually has a larger capacity, so this problem has
practical consequences mostly when the amount of room unit heat exchange capacity is critical, such as in heat pump applications.
Introduced in IDA ICE 4.8 (patch for IDA ICE 4.8 available)
Patch no: 180215
Fixed in IDA ICE 4.8 SP1
February 14, 2018
Detailed window: Simulation does not run if the window is tilted slightly downwards (59°<= SLOPEWIND < 89°).
Introduced in IDA ICE 4.8
Fixed in IDA ICE 4.8 SP1
February 6, 2018
Driving pressure over leaks and openings is always computed as if the zone was well-mixed. There will be an error for zones with a vertical temperature gradient, i.e. when displacement ventilation or given gradient is used in the Climate zone model.
Introduced in IDA ICE 2.0
Fixed in IDA ICE 5.0
October 17, 2017
Pumping power: If method Performance polynomial: Riding the pump curve is selected the pumping power is incorrect.
Introduced in IDA ICE 4.7.1 (patch for IDA ICE 4.7.1 available)
Patch no: 171017
Fixed in IDA ICE 4.8
September 29, 2017
Boreholes extension: The pressure drop calculation is not correct. The pressure drop, dp, should be multiplied with 2.
Introduced in Boreholes 1.1
Fixed in Boreholes 4.8
May 2, 2017
Lokalisierung Schweiz: Das SIA 2028 normale Design Reference Year von Pully (städtische Südhanglage westliches Mittelland) ist
falsch. Die Daten entsprechen stattdessen denjenigen von der Klimastation Piotta (Tallage Alpensüdseite).
Introduced in Localization Switzerland 4.7 (patch for Localization Switzerland 4.7.1 available)
Patch no: 170502
Fixed in Localization Switzerland 4.8
May 1, 2017
Lokalisierung Schweiz: Wenn im Modell eine wassergeführte Kühlung definiert ist, wird diese für das automatisch erstellte Modell
für den Nachweis SIA 180 C.1 sommerlicher Wärmeschutz nicht entfernt. Das Nachweismodell weist somit weiterhin eine Kühlung aus,
welche manuell zu entfernen ist.
Introduced in Localization Switzerland 4.7 (patch for Localization Switzerland 4.7.1 available)
Patch no: 170501
Fixed in Localization Switzerland 4.8
April 20, 2017
Window shading on sloped roof windows from imported shading objects is incorrectly
calculated. This can potentially lead to errors in the zone heat balance.
Introduced in IDA ICE 4.0
Fixed in IDA ICE 4.8
December 21, 2016
Time-split parallelization: When using time-split parallelization and the simulation period overlaps more than one calendar year,
a time-split period may become incorrect if it is wholly within the second year.
Introduced in IDA ICE 4.7
Fixed in IDA ICE 4.8
December 6, 2016
Exhaust air heat recovery (new AHU and corresponding ESBO plant component in 4.7.1):
-
The mass flow in the liquid circuit may become wrong.
-
The design temperature difference parameter in the ESBO plant is not available at the standard level.
-
Design conditions that do not lead to condensation are rejected.
The model still delivers physically correct results, but the design operating point becomes different from that intended.
Introduced in IDA ICE 4.7.1 (patch for IDA ICE 4.7.1 available)
Patch no: 161206
Fixed in IDA ICE 4.8
November 23, 2016
Integrated shadings in the outer window of a double façade:
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For a venetian blind, the slat angle is always 45°, regardless of set angle.
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If the control Sun is chosen, the shading is always drawn.
-
If the control Sun AND Schedule is set, the shading is controlled by the
irradiation level on the inside of the window, regardless of what is chosen.
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If New custom control (ShadeCtrlMacro) is chosen and Combined with
built-in light control is marked, the light control is ignored.
Introduced in IDA ICE 4.7 (patch for IDA ICE 4.7 & 4.7.1 available)
Patch no: 161123
Fixed in IDA ICE 4.8
November 21, 2016
Deutsche Lokalisation, DIN 4108-2 Add-In: Wenn für eine Zone
des Ausgangsmodells unter "In Betrieb" die Voreinstellung
"Wenn belegt" durch einen Zeitplan ersetzt wird so wird
diese Einstellung im DIN 4108-2 Nachweismodel beibehalten. Korrekte
Übertemperaturgradstunden erhält man nur wenn im Nachweismodell
der Wert wieder auf "wenn belegt" eingestellt wird.
Introduced in Localization Germany 4.6.1 (patch for Localization
Germany 4.7.1 available)
Patch no: 161122
Fixed in Localization Germany 4.8
November 21, 2016
Zone multipliers: In the table "Energy balance (sensible only)" in the Summary tab, zone multipliers are
ignored in the results. In all other summarizing results they are used.
Introduced in IDA ICE 4.7 (patch for IDA ICE 4.7 & 4.7.1 available)
Patch no: 161121
Fixed in IDA ICE 4.8
November 17, 2016
Wall model: When inserting a Heating/cooling floor in an edited (complex) roof,
an RCWALL model with default parameters (except the area) is wrongly used.
Introduced in IDA ICE 4.0 (patch for IDA ICE 4.7 & 4.7.1 available)
Patch no: 161117
Fixed in IDA ICE 4.8
November 16, 2016
Window area: The area of non-rectangular windows and openings inserted in faces of the building body is not
correctly calculated.
Introduced in IDA ICE 4.0 (patch for IDA ICE 4.7 & 4.7.1 available)
Patch no: 161116
Fixed in IDA ICE 4.8
November 15, 2016
Simulation time: When setting the simulation time, the date is switched incorrectly if the starting time
is late in the day or the ending time is early in the day.
Introduced in IDA ICE 4.7.1 (patch for IDA ICE 4.7.1 available)
Patch no: 161115
Fixed in IDA ICE 4.8
November 14, 2016
Daylighting: When selecting Daylighting in the Requested output under the Simulation tab, a simplified calculation
of the illuminance in zones with an occupant present is performed. When using the detailed window model with an integrated
shading that diffuses the light, the solar (total shortwave) properties are used instead of the visual properties for the
diffused light. Note that this bug does not affect the daylight calculation performed under the Daylight tab.
External shading: When setting the control of an external solar shading to a value in between 1 and 0 (which are the values
normally used for on/off), the result deviate from the expected weighted average of the results for 1 and 0.
Miljöbyggnad: The value of g-syst, given in Miljöbyggnad, includes, when using the standard window, solar heat
transferred though the frame, which is not according to the rules of Miljöbyggnad.
Introduced in IDA ICE 4.7.1 / 4.0 / 4.7 (patch for IDA ICE 4.7.1 available)
Patch no: 161114
Fixed in IDA ICE 4.8
November 8, 2016
Autosave: The Autosave function does not start to work until after a first simulation has been performed.
Introduced in IDA ICE 4.7 (patch for IDA ICE 4.7 & 4.7.1 available)
Patch no: 161108
Fixed in IDA ICE 4.8
October 18, 2016
Deutsche Lokalisation, DIN 4108-2 Add-In: Bei Nichtwohngebäuden
wird der Zeitplan "din41082-7-18 weekdays" konstant als
"0" angesetzt, auch wenn wochentags zwischen 07:00 Uhr
und 18:00 Uhr der Wert "1" angezeigt wird. Dies hat fundamentale
Auswirkungen auf die Berechnung.
Introduced in Localization Germany 4.7.1
(patch for Localization Germany 4.7.1 available)
Patch no: 161103
Fixed in Localization Germany 4.8
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